HONDA marine BF135A, Shop Manual, Page: 42 / 49

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DTC 48-6: A/F sensor V current is abnormal
1. Symptom reproduction test
-1. Connect the Dr. H and clear the DTC once. If the
DTC can not be cleared, go on the troubleshooting.
-2. Start the engine and warm it up 5 minutes or more
by running the engine at 3,000 min -1 (rpm) under no
load.
-3. Check the DTC again using the Dr. H.
Does the DTC 48-6 appear?
YES – Perform “2. A/F sensor line short circuit
check”.
NO – Temporary failure (Disappeared)
2. A/F sensor line (V line) short circuit check
-1. Turn the ignition switch OFF. Disconnect the A/F sen-
sor connector and the ECM connector A.
-2. Check for the continuity between the No. 1
(White/Black) terminal of the A/F sensor harness
side 4P connector and the engine ground.
Is there the continuity?
YES – Repair short in the wire between the A/F
sensor and the ECM.
NO – Replace the A/F sensor and recheck. If
there is any abnormality, substitute a
known-good ECM and recheck.
DTC 48-7: A/F sensor C current is abnormal
1. Symptom reproduction test
-1. Connect the Dr. H and clear the DTC once. If the
DTC can not be cleared, go on the troubleshooting.
-2. Start the engine and warm it up for 5 minutes or
more by running the engine at 3,000 min -1 (rpm)
under no load.
-3. Check the DTC again using the Dr. H.
Does the DTC 48-7 appear?
YES – Perform “2. A/F sensor line short circuit
check”.
NO – Temporary failure (Disappeared)
2. A/F sensor line (C line) short circuit check
-1. Turn the ignition switch OFF. Disconnect the A/F sen-
sor connector and the ECM connector A.
-2. Check for the continuity between the No. 2
(Black/Yellow) terminal of the A/F sensor harness
side 4P connector and the engine ground.
Is there the continuity?
YES – Repair short in the wire between the A/F
sensor and the ECM.
NO – Replace the A/F sensor and recheck. If it is
abnormal, substitute a known-good ECM
and recheck.
A/F SENSOR HARNESS
SIDE 4P CONNECTOR
VIEWED FROM THE
TERMINAL SIDE
AFV1
(WHITE/BLACK)
A/F SENSOR HARNESS SIDE
4P CONNECTOR
VIEWED FROM THE
TERMINAL SIDE
AFC1
(BLACK/YELLOW)